-<pre><em>Feature label</em>	<em>Feature Colour</em></pre> </strong>A feature
-type has a text label, and a colour (specified as a red,green,blue 24
-bit triplet either in hexadecimal (eg. 00ff00) or as comma separated
-numbers (ranging from 0 to 255)).</p>
+<pre><em>Feature label</em>	<em>Feature Colour</em><!-- 	<em>Feature links</em> --></pre> </strong>A feature
+type has a text label, and a colour specification. This can be either:
+<ul>
+ <li>A single colour specified as either a red,green,blue 24 bit
+ triplet in hexadecimal (eg. 00ff00) or as comma separated numbers
+ (ranging from 0 to 255))</li>
+ <li>A graduated colour specified as a "|" separated list
+ of fields:<pre>
+<mincolor>|<maxcolor>|[absolute|]<minvalue>|<maxvalue>[|<thresholdtype>|[<threshold value>]]
+</pre>The fields are as follows
+ <ul>
+ <li><em>mincolor</em> and <em>maxcolor</em><br>
+ Colour triplets specified as hexadecimal or comma separated values</li>
+ <li><em>absolute</em><br>
+ An optional switch indicating that the <em>minvalue</em> and <em>maxvalue</em>
+ parameters should be left as is, rather than rescaled according to the
+ range of scores for this feature type.
+ <li><em>minvalue</em> and <em>maxvalue</em><br>
+ Minimum and maximum values defining the range of scores for which the colour range will be defined over. If minvalue is greater than maxvalue then the linear mapping will have negative gradient.
+ </li>
+ <li><em>thresholdtype</em> <br>
+ Either "none", "below", or "above". <em>below</em>
+ and <em>above</em> require an additional <em>threshold value</em>
+ which is used to control the display of features with a score either
+ below or above the value.</li>
+ </ul>
+ </li>
+</ul>
+</p>